Whey

Whey is the liquid remaining after milk has been curdled and strained, typically during the production of cheese or casein. It is a byproduct of cheesemaking and contains proteins, lactose, vitamins, and minerals. It is often further processed to isolate specific components like whey protein concentrate or isolate.

Manufacturers add whey for its protein content and its ability to improve texture and mouthfeel in foods. It can act as a binder, emulsifier, and flavour enhancer. It is commonly found in baked goods, confectionery, dairy products, and sports nutrition supplements.

Whey is not considered a food additive and does not have an E-number. It is a natural component of milk. The NHS Eatwell Guide advises that dairy products like cheese and yoghurt can be part of a healthy diet, but should be consumed in moderation. Evidence on the health effects of whey protein supplements, often consumed for muscle building, is mixed and subject to ongoing research, with some studies suggesting benefits for muscle mass and recovery, while others show limited impact.